标题：Investigation of giant magnetoconductance in organic devices based on hopping mechanism
作者：Yang, F. J.; Qin, W.; Xie, S. J.
作者机构：[Yang, F. J.; Qin, W.; Xie, S. J.] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
通讯作者地址：[Xie, SJ]Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
来源：JOURNAL OF CHEMICAL PHYSICS
摘要：We suggest a spin-dependent hopping mechanism which includes the effect of the external magnetic field as well as hyperfine interaction (HFI) to explain the observed giant magnetoconductance (MC) in non-magnetic organic devices. Based on the extended Marcus theory, we calculate the MC by using the master equation. It is found that a MC value as large as 91% is obtained under a low driving voltage. For suitable parameters, the theoretical results are in good agreement with the experimental data. Influences of the carrier density, HFI, and the carrier localization on the MC value are investigated. Especially, it is found that a low-dimensional structure of the organic materials is favorable to get a large MC value. (C) 2014 AIP Publishing LLC.